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onsemi BC558BRL
- Part No.:
- BC558BRL
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-226-3, TO-92-3 Long Body, Formed Leads
- Datasheet:
-
BC558BRL.pdf
- Description:
- TRANS PNP 30V 0.1A TO92
- Quantity:
- Payment:
- Shipping:
Inventory:2,280
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Product details
Overview
BC558BRL from onsemi is a PNP silicon small-signal amplifier transistor in TO-92 package, rated for VCEO = −30 V, IC = −100 mA continuous, hFE = 220–460 at IC = −2 mA, fT = 360 MHz, and VCE(sat) ≤ −0.65 V at IC = −100 mA. It serves as a general-purpose linear amplifier or switch in low-power analog and digital interface circuits.
For engineers reviewing the BC558BRL datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, thermal limits, TO-92 terminal mapping, real-world use cases, and two validated alternative transistors with documented functional and application differences.
Technical Context
The BC558BRL operates in active, saturation, and cutoff regions with defined safe operating area (SOA) boundaries up to TJ = 150°C. Its DC current gain exhibits strong dependence on collector current and temperature, with hFE minimums specified at three test conditions: −10 mA, −2 mA, and −100 mA.
Small-signal performance includes fT = 360 MHz (typical), Cob = 3.0–6.0 pF, and NF = 2.0 dB at 1 kHz (RS = 2 kΩ), confirming suitability for audio-frequency amplification and medium-speed switching where bandwidth and noise matter.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | −30 V - Maximum allowable collector-emitter voltage before breakdown in common-emitter configuration. |
| IC (cont.) | −100 mA - Continuous collector current limit defining steady-state power handling in linear or switching operation. |
| hFE | 220–460 - DC current gain range at IC = −2 mA, VCE = −5 V, directly impacting base drive requirements. |
| fT | 360 MHz - Transition frequency indicating usable bandwidth for small-signal amplification up to ~100 MHz. |
| VCE(sat) | ≤ −0.65 V at IC = −100 mA, IB = −5 mA - Saturation voltage determining conduction loss and heat generation in switching mode. |
| RJA | 200 °C/W - Junction-to-ambient thermal resistance under free-air conditions, governing maximum power dissipation at ambient temperature. |
| PD (TA) | 625 mW - Total device dissipation at 25°C ambient, derating 5 mW/°C above that temperature. |
Pinout & Package
BC558BRL uses the industry-standard TO-92 (Case 29, Style 17) plastic package with 3 leads. The package measures 4.45–5.20 mm in length, 4.32–5.33 mm in width, and has a lead pitch of 2.54 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Collector | Main current sink terminal; connects to load or supply rail in PNP configurations. |
| 2 | Base | Control input; requires precise current limiting to achieve target hFE-dependent collector current. |
| 3 | Emitter | Current source terminal; typically tied to higher potential (e.g., VCC) in common-emitter amplifier setups. |
Key Features
| Feature | Design Value |
|---|---|
| Pb-free packaging option | Available as BC558BRLG variant per JESD97, enabling RoHS-compliant PCB assembly without solder process requalification. |
| High fT / low Cob | 360 MHz fT with 3–6 pF output capacitance supports stable gain in 10–50 MHz amplifier stages with minimal phase shift. |
| Low-noise operation | 2.0 dB noise figure at 1 kHz enables use in preamplifier stages for sensors and audio signal conditioning without added background noise. |
| Wide SOA at TA = 25°C | SOA curve supports ≥ −50 mA at −30 V in single-pulse mode, allowing robust transient handling in relay drivers and LED switches. |
Applications
| Audio Preamp Stage | Level-Shifting Interface |
|---|---|
|
Use Scenario: Amplifying weak microphone or piezoelectric sensor signals prior to ADC sampling in battery-powered IoT nodes. IC Role / Device Role / Timing Role: Linear amplifier in common-emitter configuration with emitter degeneration resistor for stable gain and bias point control. Use Value: 2.0 dB NF and hFE ≥ 220 ensure >40 dB SNR at 1–10 kHz while drawing <1 mA quiescent current. |
Use Scenario: Converting 3.3 V logic outputs to −5 V or −12 V levels for legacy industrial control inputs. IC Role / Device Role / Timing Role: Active-low level shifter using emitter-follower or common-base topology with pull-up to negative rail. Use Value: VCEO = −30 V and VCBO = −30 V support reliable operation across −5 V to −12 V interface rails without breakdown risk. |
| LED Driver Switch | Current Mirror Reference |
|
Use Scenario: Driving indicator LEDs or low-current solenoids from microcontroller GPIO pins in automotive body electronics modules. IC Role / Device Role / Timing Role: Saturated switch with base driven by MCU output through current-limiting resistor. Use Value: VCE(sat) ≤ −0.65 V at IC = −100 mA minimizes power loss and self-heating during sustained ON periods. |
Use Scenario: Building matched current sources in analog front-ends for precision sensor excitation or DAC output buffering. IC Role / Device Role / Timing Role: One leg of a discrete PNP current mirror with emitter resistors for beta compensation. Use Value: Tight hFE binning (B-series) and low VBE(on) variation (−0.55 to −0.7 V) enable <5% current matching between mirrored legs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PNP small-signal amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BC557B | VCEO = −45 V, VCBO = −50 V, hFE = 150–270 at IC = −2 mA, fT = 320 MHz | Higher voltage rating suits 24 V industrial interfaces; lower fT reduces RF susceptibility in noisy environments. | Select BC557B when system rail exceeds −30 V or when margin against VCEO overstress is critical. |
| BC858B | SOT-23 package, same hFE and fT, but RJA = 300 °C/W and PD = 300 mW | Smaller footprint saves board space but requires thermal relief pads or reduced duty cycle for equivalent power handling. | Choose BC858B only when PCB area is constrained and average power remains below 150 mW. |
Compared with BC558BRL, BC557B offers higher voltage tolerance at the cost of bandwidth, while BC858B trades thermal performance for miniaturization-neither is pin-compatible due to differing packages and thermal limits.
Availability
BC558BRL is available at Aetrix Electronics and suitable for audio preamplifiers, industrial level-shifting interfaces, and LED driver circuits requiring stable component supply across long-lifecycle embedded programs.
Supply support for BC558BRL includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
onsemi (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The BC558BRL belongs to the BC556/557/558 family of general-purpose PNP transistors designed for cost-sensitive, high-reliability linear amplification and switching in industrial controls, instrumentation, and legacy interface circuits.
FAQ
What is the maximum junction temperature for BC558BRL?
The BC558BRL has an operating junction temperature range of −55°C to +150°C. This limit governs thermal design margins: at TA = 25°C, its 625 mW power rating drops by 5 mW per °C rise, reaching zero dissipation at TA = 150°C. Exceeding +150°C risks permanent parametric shift or failure.
Does BC558BRL support Pb-free soldering processes?
Yes - the BC558BRLG variant is explicitly designated as Pb-free and complies with JESD97. Standard BC558BRL is also compatible with Pb-free reflow profiles (peak 260°C, 10 s max), as confirmed by onsemi's Soldering and Mounting Techniques Reference Manual. Both variants use matte tin lead finishes.
How does BC558BRL's hFE vary with collector current?
BC558BRL's hFE peaks near IC = −2 mA (220–460), falls to 120–300 at IC = −10 mA, and further decreases to 80–220 at IC = −100 mA. This nonlinearity must be accounted for in bias network design - fixed-base resistors may cause thermal runaway unless emitter degeneration is used.
Can BC558BRL replace BC558C in existing designs?
BC558BRL can replace BC558C only if the design operates within the B-series hFE range (220–460 vs. C-series 290–800). At IC = −2 mA, BC558C guarantees minimum hFE = 290, while BC558BRL guarantees only 220 - verify base drive sufficiency and stability margins before substitution.
What is the safe operating area (SOA) limitation for BC558BRL at 100 µs pulse width?
Per Figure 14 in the datasheet, BC558BRL supports up to −100 mA at −30 V for 100 µs pulses (single-pulse, D = 0.01). This SOA boundary is governed by second breakdown, not thermal limits. For longer pulses, consult the transient thermal impedance curve (Figure 13) to calculate peak junction temperature rise.
BC558BRL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-226-3, TO-92-3 Long Body, Formed Leads
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Transistor Type:
- PNP
- Current - Collector (Ic) (Max):
- 100 mA
- Voltage - Collector Emitter Breakdown (Max):
- 30 V
- Vce Saturation (Max) @ Ib, Ic:
- 650mV @ 5mA, 100mA
- Current - Collector Cutoff (Max):
- 100nA
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 180 @ 2mA, 5V
- Power - Max:
- 625 mW
- Frequency - Transition:
- 360MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-92 (TO-226)
BC558BRL FAQ
1.How can I place an order for BC558BRL through Aetrix?
Please submit a Request for Quotation (RFQ) for BC558BRL on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for BC558BRL reliable?
The price and inventory of BC558BRL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC558BRL is usually 5 days.
3.What payment methods are accepted for BC558BRL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC558BRL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BC558BRL?
BC558BRL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BC558BRL order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for BC558BRL?
For technical support, including BC558BRL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC558BRL requirements.
6.How does Aetrix verify that BC558BRL is sourced from the original manufacturer or authorized distributors?
All BC558BRL products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that BC558BRL meets industry standards.
7.What is the process for return or replacement of BC558BRL?
All BC558BRL units undergo pre-shipment inspection (PSI). If there is an issue with BC558BRL, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The BC558BRL part is unused and in its original packaging.
Return procedure for BC558BRL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BC558BRL Tags
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